How severe is CVE-2016-0634?

CVE-2016-0634 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-0634 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-0634?

CVE-2016-0634 affects Gnu Bash. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-0634?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-0634 published?

CVE-2016-0634 was published on 2017-08-28 and last updated on 2026-06-17.

CVE-2016-0634

CVE-2016-0634 is a high-severity vulnerability in Gnu Bash with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 6.0
EPSS exploit prediction: 6% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Gnu Bash
Published: 2017-08-28
Last modified: 2026-06-17

Description

The expansion of '\h' in the prompt string in bash 4.3 allows remote authenticated users to execute arbitrary code via shell metacharacters placed in 'hostname' of a machine.

Frequently asked questions

What is CVE-2016-0634?: The expansion of '\h' in the prompt string in bash 4.3 allows remote authenticated users to execute arbitrary code via shell metacharacters placed in 'hostname' of a machine.
How severe is CVE-2016-0634?: CVE-2016-0634 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-0634 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-0634?: CVE-2016-0634 affects Gnu Bash. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-0634?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-0634 published?: CVE-2016-0634 was published on 2017-08-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gnu:bash:4.3:*:*:*:*:*:*:*

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